Uprev NSS (in libssl) to NSS 3.21

DEPS

 # This file is used to manage the dependencies of the Chromium src repo. It is
 # used by gclient to determine what version of each dependency to check out, and
 # where.
 #
 # For more information, please refer to the official documentation:
 #   https://sites.google.com/a/chromium.org/dev/developers/how-tos/get-the-code
 #
 # When adding a new dependency, please update the top-level .gitignore file
 # to list the dependency's destination directory.
 #
@@ skipping 53 matching lines @@
   # the commit queue can handle CLs rolling openmax_dl
   # and whatever else without interference from each other.
   'openmax_dl_revision': '7a179b97899cf33d4a12c7ef590176c519016f4d',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling BoringSSL
   # and whatever else without interference from each other.
   'boringssl_revision': '6d9e5a74482bb832a6b4d9ae3d20d8f10f250bbd',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling nss
   # and whatever else without interference from each other.
-  'nss_revision': 'a676aa04ff18b30983cac03dede5861b3db62c9d',
+  'nss_revision': 'aee1b12a9a40d11e435c4c5706d55c4af24df2af',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling google-toolbox-for-mac
   # and whatever else without interference from each other.
   'google_toolbox_for_mac_revision': '401878398253074c515c03cb3a3f8bb0cc8da6e9',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling lighttpd
   # and whatever else without interference from each other.
   'lighttpd_revision': '9dfa55d15937a688a92cbf2b7a8621b0927d06eb',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling lss
@@ skipping 729 matching lines @@
   },
   {
     # A change to a .gyp, .gypi, or to GYP itself should run the generator.
     'name': 'gyp',
     'pattern': '.',
     'action': ['python', 'src/build/gyp_chromium'],
   },
 ]